Millstone



. y UNITED sTA'rEsPATENT onine-E.

E. I. HANON-VALCKE, Oll PARIS, FRANCE.

IVIILLSTONE'.

Specification of Letters Patent No. 8,037, dated April 15, 1851.

T0 all whom t may concern:

Be it known that I, E. I. HANoNfVALoxE, of Paris, in the Republic of France, have invented certain new and useful Inprovements in Millstones, and that the following is a full, clearpand exact description thereof, reference being` had to the accompanying drawings, making part of this specification, in which- Figure l, is a plan of my improved stone; F ig.` 2, a view, of `the under side, and Fig. 3, vertical section taken at the dotted line A,aofFig.2. i u u.

The same letters indicate like parts in all the figures.

The object of myvinvention is.` to secure` the introduction of` air between they stones in suflicient quantities to pre-vent the' grain from heating in the process of grinding and to keep the pollen in a perfect stateof freshne, which is the only means by which the substantial parts of the grain can be preserved froinalteration. l

Mill stones have been made prior to my invention with metal funnels, (three or more) fixed at equal distances upon the runner in such a manner as to force in air by the effect of the rotary movement, the funnels passing obliquely through the entire thickness of the runner, and entering channels cut in its under surface, byY which means, air may bein a measure supplied to keep the grain cool. Butthis arrangement is far `from being perfect for the reason that suliicient air cannot be carried between 'the stones for` want of draft. defect, myfinvention consists in combiningwith the oblique channels cut through the body of the stone and the furrows in the4 face thereof, starting from the foot of said oblique channels the use of a vertical draft tube or pipe passing directly up through the runner from near the extremity of the channel in the face of the stone, by which means a continuous draft is supplied, carry ing off the heated air from the grain which is being ground `and causing cold air to rush in through the oblique channels to keep the grain coo In the accompanying drawings Athree lor four funnels A, according to the diameter of the mill stones, are placed at equal distances upon the runner B, i-n such a manner that air will `be forced in by the rotation. The necks of these funnels enter aper-` traversing it obliquely. These passages ter` To remedy this minate in channels or' funnelsG, cut in the face of the runner. The said apertures are so located that their point of departure is found at l0 inches from the circumference, and their point of termination eight inches, when they are not wider than one inch, and the depth of the furrow at which it terminates, in such a manner that their dept-h and width continually diminishing describe a curve. l y

Near the extremity of each channel a cylindrical opening D is formed traversing almost perpendicularly the mill stone in such a manner as to enter the funnel correspond ing with this opening. In this opening is placed a metal tube of the diameter` of l-linches entering the lower side of the funnel the current entering the onefunnel will have the effect to exhaust the next aperture, and thus insure ja current of air through the apertures or passages.

The'action of this apparatus can be easily understood. the funnels by the rotatory movement and more abundant in proportion to the rapidity of the rotation is driven into the channels which traverse the furrows of the runner,

and pass continually between the mill stones. y

This air being sent toward the circumference by the effect ofthe centrifugal movement, traverses `necessarily over the The airbeing `compressed in whole of the working part of the millstones, sweeps over their sides, rushes into the furrows and penetrates between the rough surfaces of t-he mill stones, mixes with `the meal and rolls with it into the conduits.

This air, always fresh and continually renewed, receives a new activity by the circulation which the pipes placed at the extremities of the channels give to it. This circulation can be increased or diminished at will by means of thespout-s E `which can be lturned to reduce the exhausting action. i

By means of this circulation of the air, a. part of the mill dustmight be put into movement and carried through the openings intended to increaseithe circulation.`

`The spouts of the pipes are placed in such a manner as must drive back t-he'light particles of the flour into the bottom of the funnels and these instantly send them between the mill stones from whence they soon pass with the rest of the meal into the receptacles which direct the meal toward the bolting machine.

What I claim as my invention and desire to secure by Letters Patent is- Constructing the running stones of mills With oblique apertures or passages through the body of the stone and provided With hoods or funnels to collect the air during the rotation and connected on the grinding face of the stone with furroWs, substantially `as described, When this arrangement is combined with the use of vertical pipes leading from the extremity of one of the apertures or passages to a funnel leading to the next succeeding oblique passage in the body of the stone substantially in the manner and for the purpose specified.

E. I. HANON-VALCKE. YVitnesses J. B. GREENE, FRED VAN DER BROCK. 

